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Re: PHOTO-3D digest 1299

re: APS brighter..f/stops etc.
I see in this digest a clue as to why it might have been said. The 
conditions..converter etc. may have changed the marked f/stop. As does 
bellows draw for closeups on large format. i.e. focal ratio is marked at 
infinity and significant extension "alters" the real f/stop. BobH


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